The back cap holds a single set of gold RCA output jacks as well as both an optical and USB input. The mini-headphone jack has a nice tight snap. The front cap has room for the silver volume knob (surprisingly not the same color as the cylinder), and much like the N22 Amp, no notch for the volume position. A microfiber bag is included for traveling along with a USB cable. The overall feel is one of solid one-piece construction and he6. A nice bit of ergonomic design is the thin full-width rail foot on the bottom of each cap instead four rubber feet. Two recessed hex nuts secure both front and back to the cover. Each end is a cap finished in a flat anodized black though it feels a bit like suede. The gauge of metal is thicker than other small audio pieces in the budget category. The D1 is about the size of a tri-fold wallet with the body shell painted in a metallic grey. One of the hallmarks to Audioengine’s success is their build quality-beginning with the rounded sides of the case, consistent with other AW products, and homage to the Apple-inspired past in one of the founders. When I heard that they had quietly launched the D1 DAC at last year’s RMAF, I knew it was time to experience an Audioengine review for myself. From the A5 powered speakers in 2005 and way cool A-W2 wireless iPod transmitter, to the stealthily impressive N22 amplifier, Audioengine consistently delivers quality and value. Since the company’s founding in 2002, Affordable$$Audio, along with countless other audio publications, have lavished well-earned high praise for every product they’ve brought to the public. Enter into the market Audioengine, a well-respected member of the desktop/home office segment of the market.